* fix: block adding/inviting members to admins workspace on CE
The admins workspace is reserved for superadmins only. On CE (non-enterprise),
prevent adding or inviting users to it via both API and UI.
Backend: add #[cfg(not(feature = "enterprise"))] guards to invite_user and
add_user endpoints that reject requests targeting the admins workspace.
Frontend: show an info alert on the admins workspace members page and hide
the add/invite/auto-add buttons.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix: use derived variable for admins workspace alert consistency
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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